One way to begin is to read several general and specialized encyclopedia articles in order to become more familiar with various aspects topics of interest to you. As you narrow in on one general topic, begin gathering a list of keywords and concepts which you will then use for more in-depth literature searches. The more your read and the better you understand the background of a topic the easier it is to form an issue question or thesis.
Reference Universe will point you to exact volumes and pages of reference materials in the Andersen Library. Most of the titles are part of the 2nd floor Reference Collection, but you may find titles in the 3rd floor Main Collection or online.